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# frozen_string_literal: true
module API
module Validations
module Validators
class GitRef < Grape::Validations::Validators::Base
# There are few checks that a Git reference should pass through to be valid reference.
# The link contains some rules that have been added to this validator.
# https://mirrors.edge.kernel.org/pub/software/scm/git/docs/git-check-ref-format.html
# We have skipped some checks that are optional and can be skipped for exception.
# We also check for control characters, More info on ctrl chars - https://ruby-doc.org/core-2.7.0/Regexp.html#class-Regexp-label-Character+Classes
INVALID_CHARS = Regexp.union('..', '\\', '@', '@{', ' ', '~', '^', ':', '*', '?', '[', /[[:cntrl:]]/).freeze
GIT_REF_LENGTH = (1..1024).freeze
def validate_param!(attr_name, params)
revision = params[attr_name]
return unless invalid_character?(revision)
raise Grape::Exceptions::Validation.new(
params: [@scope.full_name(attr_name)],
message: 'should be a valid reference path'
)
end
private
def invalid_character?(revision)
revision.nil? ||
revision.start_with?('-') ||
revision.end_with?('.') ||
GIT_REF_LENGTH.exclude?(revision.length) ||
INVALID_CHARS.match?(revision)
end
end
end
end
end
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